CN114750392B - Low-density biological full-degradation film extrusion molding machine - Google Patents
Low-density biological full-degradation film extrusion molding machine Download PDFInfo
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- CN114750392B CN114750392B CN202110031854.6A CN202110031854A CN114750392B CN 114750392 B CN114750392 B CN 114750392B CN 202110031854 A CN202110031854 A CN 202110031854A CN 114750392 B CN114750392 B CN 114750392B
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- 238000001125 extrusion Methods 0.000 title claims abstract description 30
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 151
- 239000010408 film Substances 0.000 claims abstract description 47
- 210000004907 gland Anatomy 0.000 claims abstract description 15
- 239000010409 thin film Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000008236 heating water Substances 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 4
- 230000015556 catabolic process Effects 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 description 11
- 229920003023 plastic Polymers 0.000 description 11
- 238000010276 construction Methods 0.000 description 3
- 238000010096 film blowing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92019—Pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92209—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The low-density biological full-degradation film extrusion molding machine comprises a base, wherein a screw extruder is arranged on the base and comprises a material pipe, a screw is arranged in the material pipe, and the front end of the screw is connected with a driving device; the rear end of the material pipe is connected with a material pipe head, a material pipe head sleeve is sleeved in the material pipe head, the top of the material pipe head is connected with a die head, and the axial lead of the die head is perpendicular to the axial lead of the material pipe; the material pipe head is internally provided with a built-up sheet, the die head comprises a die core and a mouth die which are arranged on the shaft center, the outer die body is sleeved outside the die core, the gland is sleeved outside the mouth die, the die core and the mouth die are connected into an inner core, the outer die body and the gland are connected into an outer sleeve, and a material conveying channel is arranged between the inner core and the outer sleeve; the material conveying channel forms a circular thin film nozzle on the surface of the die, and the thickness of the material conveying channel contracts at a position close to the thin film nozzle to secondarily build pressure on the material. The invention has the processes of secondarily establishing pressure and suddenly releasing pressure, so that the material is puffed twice, and the produced biological full-degradable film has good effect and is convenient to popularize and apply.
Description
Technical Field
The invention relates to a film extrusion molding machine, in particular to a low-density biological full-degradation film extrusion molding machine.
Background
In recent years, plastic pollution is serious, plastic limiting orders are issued continuously in various places, and plastic bags are forbidden to be used in a limited period. The development of biodegradable materials is increasing, the application range is expanding, and the biodegradable materials are gradually replacing the traditional plastics in the fields of tableware, disposable packages, agricultural films and daily necessities. The traditional plastic bag is manufactured by a plastic film extruder, plastic particles are extruded on a die head after a material pipe is extruded by a screw and heated, and are molded after being blown up by wind.
The biodegradable material and the plastic can be processed by extrusion molding, but the material characteristics of the biodegradable material and the plastic are different, so that the film bag of the biodegradable material cannot be processed and molded by a traditional extrusion molding machine well. The traditional plastic has good fluidity and high hardness, meanwhile, the temperature range of the plasticizing area is wider, the temperature of the material pipe is not required to be particularly accurate, the melting of plastic particles is not influenced, and the extrusion molding can be realized without particularly monitoring and controlling the temperature at the discharge port of the extrusion die head; the number of the discharge holes on the extrusion die is small, so that the materials discharged from the discharge holes on two sides can be ensured to be bonded smoothly. The plasticizing zone of the biological full-degradable material has small temperature interval, poor fluidity and poor hardness, the material is coked due to the too high temperature of the material pipe, and the material cannot be melted due to the too low temperature; the temperature at the discharge port of the extrusion die head also has a high precision requirement.
The traditional extruding machine adopts the whole section of material pipe to directly heat and air-cool, a filter screen is arranged on a material pipe head sleeve to remove impurities, and an electric heating sheet is directly used for heating on an extrusion die head, so that the temperature and plasticization control of each section are not facilitated.
Chinese patent CN200510105197 discloses a hydrophobic biodegradable material, chinese patent CN2005101048579 discloses a water-soluble biodegradable material, which can reduce the density of the film formed by extrusion molding, and is beneficial to reducing the cost of the film bag. However, the processing of this new material on conventional extruders does not produce the effect of density reduction.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a low-density biodegradable film extrusion molding machine.
The technical scheme adopted by the invention is as follows: the full degradation film extrusion moulding machine of density reduction biology, its characterized in that: the device comprises a base (11), wherein a screw extruder and a wind drum (10) are arranged on the base (11), the screw extruder comprises a material pipe (4), a screw (7) is arranged in the material pipe (4), and the front end of the screw (7) is connected with a driving device; a blanking port seat (5) is arranged at the top of the front end of the material pipe (4), a material pipe head (13) is connected at the rear end of the material pipe (4), a material pipe head sleeve (14) is sleeved in the material pipe head (13), a die head (16) for extrusion molding of the low-density biodegradable film is connected at the top of the material pipe head (13), and the axial lead of the die head (16) is perpendicular to the axial lead of the material pipe (4); taking the advancing direction of the material as the backward direction;
A material pipe cold water ring (12) and a heating water cooling device are arranged on the material pipe (4) along the material travelling direction, the heating water cooling device comprises an electric heater (6) and a cold water ring (8) which are sequentially and repeatedly arranged at intervals, the electric heater (6) is of an annular structure with an opening, a temperature probe is arranged in the opening, and the air outlet end of an air drum (10) is connected with the electric heater (6) through an air pipe;
a building sheet (15) is arranged in the material pipe head (13), the building sheet (15) seals the material pipe (4), and a plurality of orifices (15-1) penetrating through the front end face and the rear end face of the building sheet (15) are arranged on the building sheet (15);
The die head (16) comprises a die core (16-3) and a die (16-2) which are arranged on a shaft center, an outer die body (16-1) is sleeved outside the die core (16-3), a gland (16-4) is sleeved outside the die (16-2), the die core (16-3) and the die (16-2) are connected into an inner core, the outer die body (16-1) and the gland (16-4) are connected into an outer sleeve, and a material conveying channel (17) is arranged between the inner core and the outer sleeve; the outer wall of the mold core (16-3) is provided with a thread groove, the material conveying channel (17) forms a circular thin film nozzle (16-7) on the surface of the die (16-2), and the thickness of the material conveying channel (17) is contracted at a position close to the thin film nozzle (16-7);
The outer die body (16-1) is provided with a temperature sensor (16-9), the gland (16-4) is provided with a temperature pressure sensor (16-8), the temperature sensor and the temperature pressure sensor (16-8) are both exposed to the material conveying channel (17), the outer side of the outer die body (16-1) is provided with a first heating device, and the outer side of the gland (16-4) is provided with a second heating device.
Further, the driving device comprises a motor (1), a speed reducing mechanism (3) and a gear box (2), the front end of the screw rod extends out of the material pipe (4) and is connected with the gear box (2) in front of the material pipe (4), the gear box (2) is connected with the speed reducing mechanism (3), and the speed reducing mechanism (3) is in power connection with the motor (1).
Further, a feeding hole (16-5) is formed in the bottom of the mold core (16-3), 4-12 feeding branch holes (16-6) are communicated between the top end of the feeding hole and the spiral groove, and the feeding branch holes (16-6) are arranged in a radioactive mode at intervals by taking the feeding hole (16-5) as the center.
Further, the number of the feed branch holes (16-6) is 8.
Further, the thickness of the film nozzle (16-7) is 0.8 mm-1.5 mm.
Further, the film spouts (16-7) have a thickness of 0.8mm.
Further, a pressure sensor is arranged in the material pipe head (13) and positioned at the front side of the building sheet (15).
Further, the water inlet ends of the material pipe cold water ring (12) and the cold water ring (8) are respectively provided with an electric water valve (9).
Further, the material conveying channel sequentially comprises a spiral conveying groove (17-1), an annular gap buffer belt (17-2), a tapered conical surface gap (17-3) and an annular film nozzle (16-7) from front to back.
Further, the construction sheet (15) is perpendicular to the axis of the material pipe (4), the construction sheet (15) is tightly propped against the inside of the material pipe head (13) by the material pipe head sleeve (14), and the plurality of orifices (15-1) are uniformly distributed on the construction sheet (15).
The biodegradable material enters the material tube head after the material tube is extruded by the screw and heated, the pressure is built once through the built-up sheet, and when the biodegradable material is extruded from the orifice on the built-up sheet, the pressure is suddenly released at the other side of the built-up sheet, so that the material is puffed, and the density is reduced; and then the biodegradable material flows into a material conveying channel of the die head and is extruded at a film nozzle, the thickness of the material conveying channel is contracted at the film nozzle, so that the biodegradable material is secondarily pressurized at the film nozzle, the biodegradable material is extruded from the film nozzle and then enters the outside to suddenly release pressure, the material is puffed again, the density is further reduced, and then the biodegradable material is formed by air inflation.
The beneficial effects of the invention are as follows: compared with the traditional plastic extruding machine, the temperature control precision of the material pipe and the film nozzle is higher, so that the temperature is always kept within the plasticizing temperature range required by the film blowing of the biodegradable material. The process of secondarily establishing pressure and suddenly releasing pressure on the biodegradable material enables the material to be puffed twice, so that the density of the extruded film can be reduced, and the cost of the film bag can be reduced.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a top view of the present invention.
Fig. 3 is a perspective view of the present invention.
Fig. 4 is a cross-sectional view of the present invention.
Fig. 5 is a partial enlarged view at a in fig. 4.
Fig. 6 is a schematic structural view of the build-up sheet.
Fig. 7 is a front view of the build-up sheet.
Fig. 8 is a sectional view taken along the direction B-B in fig. 7.
Fig. 9 is a schematic structural view of a die.
Fig. 10 is a cross-sectional view of a die.
Reference numerals illustrate: 1. a motor; 2. a gear box; 3. a speed reducing mechanism; 4. a material pipe; 5. a blanking port seat; 6. an electric heater; 7. a screw; 8. a cold water ring; 9. an electric water valve; 10. a wind drum; 11. a base; 12. a material pipe cold water ring; 13. a material pipe head; 14. a material pipe head sleeve; 15. building a tablet; 151. an orifice; 16. a die head; 16-1, an outer die body; 16-2, a mouth mold; 16-3, a spiral mold core; 16-4, gland; 16-5, a feeding hole; 16-6, feeding branch holes; 16-7, film nozzle; 16-8, a temperature and pressure sensor; 16-9, a temperature sensor; 17. a material conveying channel; 17-1, a spiral conveying chute; 17-2, an annular gap buffer zone; 17-3, gradually reducing the conical surface gap.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships as indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or component referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.
In the description of the present invention, it should be noted that unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between the two components. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to the attached drawings, the low-density biological full-degradation film extrusion molding machine is characterized in that: the device comprises a base 11, wherein a screw extruder and a wind drum 10 are arranged on the base 11, the screw extruder comprises a material pipe 4, a screw 7 is arranged in the material pipe 4, and the front end of the screw 7 is connected with a driving device; the driving device comprises a motor 1, a speed reducing mechanism 3 and a gear box 2, wherein the front end of a screw rod extends out of a material pipe 4 and is connected with the gear box 2 in front of the material pipe 4, the gear box 2 is connected with the speed reducing mechanism 3, and the speed reducing mechanism 3 is in power connection with the motor 1. Wherein, the motor 1 can be a three-phase motor, a servo motor or even a hydraulic motor; the reduction mechanism 3 may be a belt flywheel or a gear.
The top of the rear end of the material pipe 4 is provided with a blanking port seat 5, the rear end of the material pipe 4 is connected with a material pipe head 13, a material pipe head 14 is sleeved in the material pipe head 13, the top of the material pipe head 13 is connected with a die head 16 for extrusion molding of the low-density biodegradable film, and the axial lead of the die head 16 is perpendicular to the axial lead of the material pipe 4; the material travelling direction is taken as the backward direction.
A material pipe cold water ring 12 and a heating water cooling device are arranged on the material pipe 4 along the material travelling direction, the heating water cooling device comprises an electric heater 6 and a cold water ring 8 which are repeatedly arranged at intervals in sequence, the electric heater 6 is of a ring-shaped structure with an opening, a temperature probe is arranged in the opening, and the air outlet end of an air drum 10 is connected with the electric heater 6 through an air pipe; the opening of the electric heater 6 can be arranged above or in any direction, and is mainly used for installing a temperature probe and dispersing wind; the water inlet ends of the pipe cold water ring 12 and the cold water ring 8 are provided with electric water valves 9.
The material pipe head 13 is internally provided with a building sheet 15 for building pressure once to preliminarily reduce the material density, the building sheet 15 is perpendicular to the axis of the material pipe, the building sheet 15 is tightly propped in the material pipe head 13 by a material pipe head sleeve 14, the building sheet 15 seals the material pipe 4, the building sheet 15 is provided with a plurality of orifices 15-1, and the plurality of orifices 15-1 are distributed on the building sheet 15 in a circular array. In this embodiment, the diameter of each of the flow holes 15-1 is designed to be 3mm, and the number of the flow holes 15-1 can influence the pressure of the build-up sheet 15. A pressure sensor is installed in the material pipe head 13 and positioned at the front side of the pressure building sheet 15. To monitor and ensure the desired conditions, or may not be installed, where experience is required to control and replace the optional pressure building block 15 to build up pressure.
The die head 16 comprises a die core 16-3 and a die 16-2 which are arranged on a shaft center, an outer die body 16-1 is sleeved outside the die core 16-3, a gland 16-4 is sleeved outside the die 16-2, the die core 16-3 and the die 16-2 are connected into an inner core, the outer die body 16-1 and the gland 16-4 are connected into an outer sleeve, and a material conveying channel is arranged between the inner core and the outer sleeve; the bottom of the mold core 16-3 is provided with feed holes 16-5, 4-12 feed branch holes 16-6 are communicated between the top ends of the feed holes and the spiral groove, and the feed branch holes 16-6 are arranged in a radioactive mode at intervals by taking the feed holes 16-5 as the center. Wherein, the number of the feeding branch holes 16-6 with the best cost performance is 8.
The outer wall of the mold core 16-3 is provided with a thread groove, and the thread groove is reduced from deep to shallow and finally disappears; the material conveying channel forms a circular film nozzle 16-7 on the surface of the die (16-2), the thickness of the material conveying channel is contracted at a position close to the film nozzle 16-7, and the material is secondarily pressurized; the material conveying channel sequentially comprises a spiral conveying chute 17-1, an annular gap buffer belt 17-2, a tapered conical surface gap 17-3 and an annular film nozzle 16-7 from front to back. The thickness of the film nozzle 16-7 is 0.8 mm-1.5 mm, wherein the thickness of the film nozzle 16-7 with the best cost performance is 0.8mm.
The outer die body 16-1 is provided with a temperature sensor, the gland 16-4 is provided with a temperature pressure sensor 16-8, the temperature sensor and the temperature pressure sensor are both exposed to the material conveying channel, the outer side of the outer die body 16-1 is provided with a first heating device, and the outer side of the gland 16-4 is provided with a second heating device.
The biodegradable material treated in this embodiment is a hydrophobic biodegradable material disclosed in chinese patent CN200510105197 or a water-soluble biodegradable material disclosed in chinese patent CN2005101048579, and the material swells under the condition of suddenly releasing pressure, so as to reduce the density of the material.
The working process of the invention is as follows: the biodegradable material enters the material tube head from the rear end of the material tube, is subjected to one-time pressure building through the building sheet, and is extruded from the orifice on the building sheet, and then the pressure is suddenly released, so that the material is puffed, and the density is primarily reduced; the biological full-degradable material flows to a plurality of feeding branch holes through the top ends of the feeding holes to enter the spiral conveying chute, and compared with a common film blowing machine die head, the feeding branch holes are designed to be 4-12, the plurality of feeding branch holes can enable the biological full-degradable material to be uniformly conveyed into the spiral conveying channel, and the spiral conveying chute mainly enables the temperature of the biological full-degradable material to be more uniform.
Compared with a common film blowing machine die head, the thickness of the film nozzle is smaller and is only 0.8-1.5 mm, and the material conveying channel is gradually contracted, so that the biodegradable material is subjected to secondary pressure building, the biodegradable material is extruded from the film nozzle and then enters the outside to suddenly release pressure, and the material is puffed again, thereby further reducing the density.
The embodiments described in the present specification are merely examples of implementation forms of the inventive concept, and the scope of protection of the present invention should not be construed as being limited to the specific forms set forth in the embodiments, and the scope of protection of the present invention and equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.
Claims (10)
1. The full degradation film extrusion moulding machine of density reduction biology, its characterized in that: the device comprises a base (11), wherein a screw extruder and a wind drum (10) are arranged on the base (11), the screw extruder comprises a material pipe (4), a screw (7) is arranged in the material pipe (4), and the front end of the screw (7) is connected with a driving device; a blanking port seat (5) is arranged at the top of the front end of the material pipe (4), a material pipe head (13) is connected at the rear end of the material pipe (4), a material pipe head sleeve (14) is sleeved in the material pipe head (13), a die head (16) for extrusion molding of the low-density biodegradable film is connected at the top of the material pipe head (13), and the axial lead of the die head (16) is perpendicular to the axial lead of the material pipe (4); taking the advancing direction of the material as the backward direction;
A material pipe cold water ring (12) and a heating water cooling device are arranged on the material pipe (4) along the material travelling direction, the heating water cooling device comprises an electric heater (6) and a cold water ring (8) which are sequentially and repeatedly arranged at intervals, the electric heater (6) is of an annular structure with an opening, a temperature probe is arranged in the opening, and the air outlet end of an air drum (10) is connected with the electric heater (6) through an air pipe;
a building sheet (15) is arranged in the material pipe head (13), the building sheet (15) seals the material pipe (4), and a plurality of orifices (15-1) penetrating through the front end face and the rear end face of the building sheet (15) are arranged on the building sheet (15);
The die head (16) comprises a die core (16-3) and a die (16-2) which are arranged on a shaft center, an outer die body (16-1) is sleeved outside the die core (16-3), a gland (16-4) is sleeved outside the die (16-2), the die core (16-3) and the die (16-2) are connected into an inner core, the outer die body (16-1) and the gland (16-4) are connected into an outer sleeve, and a material conveying channel (17) is arranged between the inner core and the outer sleeve; the outer wall of the mold core (16-3) is provided with a thread groove, the material conveying channel (17) forms a circular thin film nozzle (16-7) on the surface of the die (16-2), and the thickness of the material conveying channel (17) is contracted at a position close to the thin film nozzle (16-7);
The outer die body (16-1) is provided with a temperature sensor (16-9), the gland (16-4) is provided with a temperature pressure sensor (16-8), the temperature sensor and the temperature pressure sensor (16-8) are both exposed to the material conveying channel (17), the outer side of the outer die body (16-1) is provided with a first heating device, and the outer side of the gland (16-4) is provided with a second heating device.
2. The reduced density biodegradable film extrusion molding machine according to claim 1, wherein: the driving device comprises a motor (1), a speed reducing mechanism (3) and a gear box (2), wherein the front end of the screw rod extends out of the material pipe (4) and is connected with the gear box (2) in front of the material pipe (4), the gear box (2) is connected with the speed reducing mechanism (3), and the speed reducing mechanism (3) is in power connection with the motor (1).
3. The reduced density biodegradable film extrusion molding machine according to claim 1, wherein: the bottom of the mold core (16-3) is provided with a feeding hole (16-5), 4-12 feeding branch holes (16-6) are communicated between the top end of the feeding hole and the spiral groove, and the feeding branch holes (16-6) are arranged in a radial mode at intervals by taking the feeding hole (16-5) as the center.
4. A reduced density biodegradable film extrusion molding machine according to claim 3, wherein: the number of the feeding branch holes (16-6) is 8.
5. The reduced density biodegradable film extrusion molding machine according to claim 1, wherein: the thickness of the film nozzle (16-7) is 0.8 mm-1.5 mm.
6. The low-density biodegradable film extrusion molding machine according to claim 5, wherein: the thickness of the film nozzle (16-7) is 0.8mm.
7. The reduced density biodegradable film extrusion molding machine according to claim 1, wherein: a pressure sensor is arranged in the material pipe head (13) and positioned at the front side of the building sheet (15).
8. The reduced density biodegradable film extrusion molding machine according to claim 1, wherein: and electric water valves (9) are arranged at the water inlet ends of the material pipe cold water ring (12) and the cold water ring (8).
9. The reduced density biodegradable film extrusion molding machine according to claim 1, wherein: the material conveying channel (17) sequentially comprises a spiral conveying groove (17-1), an annular gap buffer belt (17-2), a tapered conical surface gap (17-3) and an annular film nozzle (16-7) from front to back.
10. The reduced density biodegradable film extrusion molding machine according to claim 1, wherein: the density-reducing production tablet (15) is perpendicular to the axis of the material pipe (4), the production tablet (15) is tightly propped against the inside of the material pipe head (13) by the material pipe head sleeve (14), and the full-degradable film extrusion molding machine is characterized in that: the plurality of throttle holes (15-1) are uniformly distributed on the pressing sheet (15).
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| CN202110031854.6A CN114750392B (en) | 2021-01-11 | 2021-01-11 | Low-density biological full-degradation film extrusion molding machine |
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| CN116872463B (en) * | 2023-07-18 | 2024-02-13 | 深润防水科技(山东)有限公司 | High polymer material L-shaped single pump conveying extrusion calendaring device |
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